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Schrodinger operators, operators on manifolds, general differential operators, numerical studies, integral operators, discrete models, resonances, non-self-adjoint operators, random operators/matrices

18 votes

The first eigenvalue of the laplacian for complex projective space

The spectrum of the Laplacian of $\mathbb C P^n$ with the Fubini-Study metric is $$Spec(\Delta_{\mathbb C P^n})=\{4k(n+k):k\in\mathbb N\} \quad\quad(*)$$ So, the first non-zero eigenvalue of $\m …
Renato G. Bettiol's user avatar
5 votes
Accepted

First eigenvalue of the Laplacian on Berger spheres

Tanno, the same author of the paper above mentioned in the case of 1-dim fibers, has another paper one year later [Tanno, Shûkichi. Some metrics on a $(4r+3)$-sphere and spectra. Tsukuba J. Math. 4 (1 …
Renato G. Bettiol's user avatar
10 votes

Exotic spectrum of Laplace operator

Regarding the asymptotic behavior of the spectrum of the Laplacian (or, as the OP puts it, the behavior at infinity), the most basic result is Weyl's asymptotic formula (see Chavel's book, p.172): let …
Renato G. Bettiol's user avatar
6 votes

Lower bound on the first eigenvalue of the Laplace-Beltrami on a closed Riemannian manifold

A well-known result of Y. Colin de Verdière states that given any compact connected manifold $M$, with $\dim M\geq 3$, and any finite sequence $0<a_1\leq\dots\leq a_k$, there exists a Riemannian metri …
Renato G. Bettiol's user avatar
20 votes
Accepted

Avoiding integers in the spectrum of the Laplacian of a Riemann surface

I was informed by Sugata Mondal at the MPI that Scott Wolpert proved the following result in his 1994 Annals paper Disappearance of cusp forms in special families: Theorem 5.14. The eigenvalues of …
Renato G. Bettiol's user avatar